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The trial began Tuesday for a boy accused of killing his father. The now 12-year-old-boy has plead not guilty by reason of insanity in the point-blank shooting death of white supremacist leader Jeff Hall. If he is found guilty, the boy will be jailed until his 23rd birthday. Jacob Rascon reports from Riverside for the NBC4 News at 5 p.m. on Oct. 30, 2012. (Published Tuesday, Oct. 30, 2012)

Updated at 5:15 AM PDT on Wednesday, Oct 31, 2012

The trial began Tuesday against a 12-year-old boy accused of executing his neo-Nazi father as he slept on the family's living room couch, in what prosecutors call "a case that shocks the conscience."

Last May, the boy, then 10, allegedly fatally shot his father Jeff Hall, a white supremacist leader and the west coast director for the National Socialist Movement.

Attorneys for the child, who has admitted to the killing in his Riverside home, blame the murder on the neo-Nazi environment. They also say the boy’s stepmother encouraged him to pull the trigger.

But prosecutors argue the "cold, calculated murder" was totally unrelated to neo-Nazism.

Before he was a white supremacist, Jeff Hall was a construction worker in the Inland Empire. Family members described him as "loving" and a "good father" at that time.

His son, who would later kill him, was not loving or good, according to prosecutors. They pointed out that officials kicked the boy out of as many as nine elementary schools for bad behavior. He allegedly stabbed a teacher with a pencil once and choked another with a telephone cord.

Prosecutors say the boy told his younger sister he would shoot their father two days before he did. She will testify later in the trial.

In a taped interview between the boy and a detective shown in court, the boy can heard saying that he killed his father because he’d had enough of his father’s abusive behavior.

Attorneys expect the trial to last two weeks.

If convicted, the boy could be jailed until he is 23. He has pleaded not guilty by reasons of insanity.